【摘要】 为解决认知无线电中空闲频谱的识别问题,综述了近期世界范围内的频谱检测方法。分析了基于信道衰落、噪声特性等因素对频谱检测性能的影响,指出了物理层检测、MAC(Media Access Control)层自适应检测以及多用户合作检测的关键技术问题及其分析处理方法,并对检测性能进行了定性和定量的分析和探讨。更多还原

【Abstract】 In order to solve the problem of spectrum recognization in cognitive radio,the spectrum sensing methods of recent years are described.Local spectrum sensing schemes in cognitive radio network were introduced.The impact of spectrum sensing under shadowing/fading environments and noise uncertainty,and adaptive MAC(Media Access Control)-layer sensing algorithm was analyzed with emphasis.The effect of the selection of data fusion and decision algorithms,shadowing correlation,the presence of distrusted users on detection performance of cooperative spectrum sensing was also discussed.更多还原